Shots were fired Thursday morning on the Foothill (210) Freeway in Irwindale but there were no injuries.
The shooting was reported at 7:55 a.m. on the eastbound Foothill Freeway at the Irwindale Avenue off-ramp, said California Highway Patrol Officer Tony Polizzi.
The alleged shooter was taken into custody, Polizzi said.
No injuries were immediately reported.
The Irwindale Police Department has taken over the investigation and would provide further details, Polizzi said.
Meanwhile, the CHP issued a SigAlert shutting down the Irwindale Avenue off-ramp from the eastbound Foothill Freeway for the shooting investigation.